Brain PDF: Desktop PDF Editor

Syntac LLC

About this app

Brain PDF is a desktop-class PDF editor, reader and annotator for Android phones and tablets. Built for real work with a keyboard and mouse or with touch, it brings a complete desktop-style PDF workspace to your device.

VIEW AND NAVIGATE
• Single-page, continuous and two-page spread reading with cover page support
• Smooth zoom up to 500%, pinch, fit to page, fit to width and marquee zoom
• Night mode, sepia and high-contrast page colours
• Find and advanced search, bookmarks, page thumbnails and a comments list

EDIT AND ORGANIZE
• Edit existing text right on the page, in the document's own font
• Edit images: move, resize, crop, replace, copy and paste, save or delete
• Add text boxes, images, links, headers, footers, page numbers and watermarks
• Sort, reorder, rotate, extract, duplicate, delete and split pages
• Combine several PDFs and images into one document
• Compress: choose the image quality and see the new file size before you save

ANNOTATE AND REVIEW
• Highlight, underline, strikethrough and squiggly markups snapped to text
• Sticky notes, text boxes, callouts and shapes (rectangle, oval, line, arrow, polygon, cloud)
• Freehand drawing with stylus pressure, and an eraser
• Standard, dynamic and custom image stamps

FILL AND SIGN (OFFLINE)
• Fill in PDF forms: text fields, check boxes, radio buttons and dropdowns
• Drawn, typed or image signatures and initials, saved for reuse
• Offline signature requests with a guided signer flow and an audit trail
• Digital certificate signing (PKCS#12) and signature validation

SCAN, OCR AND CONVERT
• Document scanner with automatic cropping and perspective correction
• On-device OCR turns scans into searchable, selectable text
• Export to Word (.docx), Excel (.xlsx), PowerPoint (.pptx), RTF, HTML, text and images (PNG/JPEG)

PROTECT AND REDACT
• AES-256 password protection and permission controls (printing, copying)
• Permanent text and area redaction, and removal of hidden information
• Compare two versions of a document, with the changed words highlighted

PRIVATE AND OFFLINE
• No account and no ads
• Your documents are processed on your device and never uploaded

What’s new

Bug fixes and performance improvements.